#include <proto/exec.h>
#include <proto/tinygl.h>

static void display(void);

struct ExecBase *SysBase;
struct Library *TinyGLBase;
GLContext *__tglContext;

#define __TEXTSECTION__ __attribute__((section(".text")))

/* __abox__ symbol is required or else the binary is loaded as PowerUP app.
   We use a nice trick here and call the main function __abox__.. saves 4
   bytes.. ;-)
*/
int __abox__(void)
{
  SysBase = *(struct ExecBase **) 4;
  TinyGLBase = OpenLibrary("tinygl.library", 50);
  if (TinyGLBase)
  {
    __tglContext = GLInit();
    if (__tglContext)
    {

      glutInit(NULL,NULL);//&argc, argv);

      glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
      glutInitWindowSize(640, 480);
      glutFullScreen();
      glutCreateWindow(NULL);

      glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
      glClearDepth(1.0f);
      glEnable(GL_DEPTH_TEST);
      glMatrixMode(GL_PROJECTION);
      gluPerspective(80, 640.0 / 480.0, 1.0, 5000.0);
      glMatrixMode(GL_MODELVIEW); 

      glutDisplayFunc(display);

      glutMainLoop();

      GLClose(__tglContext);
    }

    CloseLibrary(TinyGLBase);
  }
  return 0;
}

static void display(void) 
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  glutSwapBuffers();
}